of a metallic cylinder pipe is 748 cm cube , it's length is 14cm and its external radius is 9cm, find it's thickness.
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External radius (R) = 9 cm.
Internal radius (r) = x cm.
Height (h) = 14 cm.
Volume (V) = 748 cu. cm .
➡️ We have,
V = × h (R^2 - r^2)
748 = 22/7 × 14 × (9^2 - x^2)
748/44 = 81 - x^2
x^2 = 81 - 17
x = 8
.°. Thickness = R - r = (9 - 8) cm = 1 cm.
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